A two-step photoionization scheme is used to determine vibrational frequencies of the n=3 Rydberg states of triatomic hydrogen. Symmetric-stretch frequencies in orthotrihydrogen of 3212.1 and 3168 cm−1 are measured for the N=1 levels of the states 3s 2A′1 and 3d 2E″, respectively. Transitions to bending-mode excited levels in the 3d states and overtone levels of the 3p 2 E′ state are observed also.
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Lembo et al. (1989) studied this question.
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